Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8ee5df14d61ed6…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 16:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e85bf18af51babac4ae777c5e055f60 SHA-1: 84850ec545ea904259e461a1b1ecb05dab8f70d8 SHA-256: dc8ee5df14d61ed6fddb383be944b2c337d5bee950ad7c392acdc6f10593dbfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely acting as a dropper or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=wrong+turn+6+full+movie+download+300mb PDF link annotation
    • http://asv-solnice.cz/_files/file/kamaju.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/rixogogezosokitafin.pdfIn PDF document text
    • https://maymac.info/userfiles/file/sewomuzimusisuribonaji.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/79000754625.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/62693237630.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/92249940250.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/xujamepe.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/85935366.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/sefegorajonitipofoka.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/69930109373.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/joxepubabigo.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/33567516126.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613787904bbc3---zemuxumalejutotoxetufexo.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/pusasolifimu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf8252b4a6---xaxifupisa.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/kawujigevarosawe.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/walerupumif.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/67498161761.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134e8867dbaf---60438734512.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/26402854385.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36358600605.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/nofok.pdfIn PDF document text
    • https://people11people.gr/uploads/File/vurofulejoxaxowumewufi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE681 17256 bytes
SHA-256: fc9cf7a0d8166712de76123e7ec01bac40132eddbd11924fd06e4a436fb1be98
font_01_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5F 11376 bytes
SHA-256: 81ecf096c04935402cddabcc73b5971ef827a72b7081e15c751e06a7bc127837

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